Station selector



Apr; 24, 1923. 1,452,903

0. K. BAKKEN STATION SELECTOR Filed Jan. 30 1920 2 Sheets-Sheet 2 /lz I/vvE/vT'oR:

OLE H. BAKKEN WWMW Arrow/v: Va.

gust 31,

Patented Apr. 24, 1923.

NHTE STTE OLE K. BAKKEN, OF NOBTHWOOID, NORTH DAKOTA.

STATION SELECTOR.

Application filed January 30, 1920. Serial No. 355,289.

T 0 all whom it may concern Be it known that 1, 0m K. BAKKEN, a citizen of the United States, residing at Northwood, in the county of Grand Forks and State or North Dakota, have invented certain new' and useful Improvements" in Station Selectors, or which the following is a specification.

My invention relates to and particularly to a selective ringing device for party line exchanges. This application is a continuation in part of my prior application, Serial No. 189,220,. filed An- 1917. The principal objects of my invention are as follows: To'provide means whereby a signal may be operated at any desired instrument for a party communication line without operating the signal of other instruments of the line; to provide means which'will eliminate the attendant evils such as listening which accompany the simultaneous ringing of all signals on a party line; to render available the advantages of a private line while avoiding the multiplicity of main line wires; in general to improve the form of telephonic communication on party lines by providing selecting means which enables an operator to signal and communicate with anyone of the party instruments on a party line without signaling other instruments of this line.

The full objects of my invention will appear in connection with the detailed description thereof and the novel features embodied in my inventive idea will be particularly pointed out in the claim.

In the accompanying drawings which illustrate the application of my invention in one form,-

Fig. 1 is a diagrammatic view showing the ratchet wheel in its normal position. Fig. 2 is a diagrammatic view showing the ratchet wheel after it has been operated three times. Fig. 3 is a diagrammatic view showing the ratchet wheel released and returned to normal position. Fig. 4: is an edge view of the ratchet wheel and pawl.

The drawings show my improved device as it is installed in one of the houses on the party line and it is notnecessary to show the installation "for each of the houses on the line, since the device is the same for all of them except that for each house the device is set for the particular number assigned to that house. Upon a board 10 there is mounted a segmental ratchet wheel station selectors adapted to 12 which is capable of partial rotation upon a spindle 14:, the normal position of the ratchet wheel being determined by a pin 16 carried by the board 10. The ratchet wheel normally occupies the position shown in Fig. 1 with its right hand portion in engagement with the stop 16. The ratchet wheel is provided with a plurality of teeth consecutively numbered to correspond with the numbers assigned'to the difierent houses, and, as shown in the drawings, these numbers range from 1 to 14, thus providing for a fourteen-party line. Mounted upon the board 10 is a polarized electro magnet 18 of well known construction which is ailected only by a relatively high tension current. This high tension current may be produced by a magneto which supplies a slowly alternating current. Such magnetos are well known and do not need to be described for a full understanding of my improved features of construction. The electro magnet 18 is provided with an armature 20 which carries a bar 22, to the lower end of which is pivoted an arm 2% provided with a pawl 26 engage the teeth of the ratchet wheel 20 and turn the same the space of one tooth at a time. The outer end of the arm 24 is attached to a link 28. The arm 24 extends through a slot in the link 28 so that the pawl 26 may move from tooth to tooth without moving the link. @ne end of this link is connected to a detent 30 by a pin and slot connection, and the other end of the link is pivoted to the lower end of an armature 32 associated with an electro magnet 34-. This electro magnet is of well known construction so wound as to be afiected only by a relatively low tension current. The ratchet wheel 12 carries an arm 36 which may be set to correspond with the number assigned to any particular house, and in the drawings it is shown set for No. 3. When the device is thus set and it is desired to .call this number from the central station three impulses of an alternating current are sent through the main line and these impulses cause the pawl 26 to operate three times and bring the ratchet wheel to the position shown in Fig. 2 so that the arm 36 engages a bow 38 and moves the same into engagement with a stop post a0. It is obvious that the ratchet wheel at the place which is called may bereadily moved the desired number of times since it is operated by a slowly alternating current and the operator observes the movement of one of the ratchet wheels at the place from which he is signaling. Although the ratchet wheels at all of the houses on the houses on the line will be actuated three times the one set for the No. 3 is the only one in which the how 38 will be retained in contact with the post "l0. After this has been done the operator at the central station pushes a button and sends a direct current through all of the electro n gnets 3%. The ariuatii thereb attracted, but, as will be apparent from Fig. 1, all of these armatures except the one on the device set for the No. 3 will pass the end of the bow 38 since only this one bow has at this time an engagement in raised position with the post ll). When the armatures 32 are attracteu it will be seen from Fig. that all of the pawls 26 and de tents are pulled up from engagement with the ratchet wheels so that all of the ratchet wheels are free to return to their initial or zero position. At the same me the direct current troin the central station rings the bell ell at the house numbered 3, since a circuit is pro ded by means of a path for current extent ,2; through the bow 5S and the insulated wire 43 when the parts are in the position shown in Fig. The wire 423 extends from the bell to an insulated contact point in the lower end of the armature. In order that a person at any house may be able to call Central I provide a local battery l in shunt circuit adapted to be closed by a push button s6 which is secured to a spring member d7 connected to the wire d8 forming part of the main circuit so that upon pushing the button the circuit from the battery a l is completed and a signal is operated at the central station when the device is in normal position. The member 4'? is resilient and is lined at upper end while its lower end carries a contact 49 which normally engages a fixed contact 50. The resiliency of the member l? is suilicient to maintain the contact d9 in circuit closing on gement with the contact 50. The button iGis secured to the member 4. and passes through the same and when this button is pushed. the circuit through the members 49 and 50 is broken and the inner end or stem of the button engages a contact connected with one side oi": the battery so that the latter is placed in the circuit which goes to the central station.

lVhile my device has been described in connection with a central station it is obvious that the same construction may be enioloyed in system in which the device at a house is used in directly calling any other house on the party line without the necessity oi first calling; central. In this case a generator is used at each house which will send alternating current through the ;ro magnet lb and cause the wheel 12 to so moved one tooth at a time until the desired number is reached. it will be under cash of the houses on the line.

to sch house corresponding to from one to fourteen It is not necessary to show the generator which is used,

. since this niight obviously be the well known ur c eto previously referred to which sup cs a slow alternating high tension current.

I claim:

selective signaling device for party comprising signaling means, a ratchet a. heel, an arm adapted to be fixed in differpositions on said ratchet wheel, a pawl aging); said ratcnct wheel, a stationary tro mag ct, connections between said fl and the armature oi said electro magnet r-zhereby successive electrical impulses move said ratchet wheel progressively, a pivoted bow-shaped member normally in inopera I e position and adapted to be T'ElOR'Oil said arm into circuit-making poiytion tor operating said signaling means, a second stationary and independent electro iet having an a .ature adapted to be or by an electrical impulse into contact with said bow-shaped memberto complete circuit through said signaling means, a (itiflli for said ratchet wheel, and a link connec second mentioned armature with said p? and said detent whereby said p wl and said detent are both lifted away from said ratchet wheel when said second mentioned ture is attracted.

in testimony whereof I hereunto afiix my signature.

OLE K. BAKKEN. 

